C Relational & Logical Operators Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Relational & Logical Operators – 2”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. Are logical operator sequence points?
a) True
b) False
c) Depends on the compiler
d) Depends on the standard
View Answer

Answer: a
Explanation: None.

2. Do logical operators in the C language are evaluated with the short circuit?
a) True
b) False
c) Depends on the compiler
d) Depends on the standard
View Answer

Answer: a
Explanation: None.

3. What is the result of logical or relational expression in C?
a) True or False
b) 0 or 1
c) 0 if an expression is false and any positive number if an expression is true
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

4. What will be the final value of d in the following C code?

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```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 10, b = 5, c = 5;
```
```
        int d;
```
```
        d = b + c == a;
```
```
        printf("%d", d);
```
```
    }
```

a) Syntax error
b) 1
c) 5
d) 10
View Answer

Answer: b
Explanation: None.

5. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 10, b = 5, c = 3;
```
```
        b != !a;
```
```
        c = !!a;
```
```
        printf("%d\t%d", b, c);
```
```
    }
```

a) 5 1
b) 0 3
c) 5 3
d) 1 1
View Answer

Answer: a
Explanation: None.

6. Which among the following is NOT a logical or relational operator?
a) !=
b) ==
c) ||
d) =
View Answer

Answer: d
Explanation: None.

7. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 10;
```
```
        if (a == a--)
```
```
            printf("TRUE 1\t");
```
```
        a = 10;
```
```
        if (a == --a)
```
```
            printf("TRUE 2\t");
```
```
    }
```

a) TRUE 1
b) TRUE 2
c) TRUE 1 TRUE 2
d) Compiler Dependent
View Answer

Answer: d
Explanation: This is a sequence point problem and hence the result will be implementation dependent.

8. Relational operators cannot be used on ____________
a) structure
b) long
c) strings
d) float
View Answer

Answer: a
Explanation: None.

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